Pressure relief and transparency enhancement method using pneumatic flexible tool

Abstract

The present application proposes a method for pressure relief and permeability enhancement using a pneumatic flexible tool, the method comprising the following steps: step 1, connecting an air compressor, a high-pressure air pipe, a drilling rig, a drill rod, a pneumatic flexible tool and a slitting device in sequence; step 2, adjusting the position of the drill rod and moving the slitting device to a target position in a coal hole; step 3, turning on the air compressor and delivering high-pressure gas to the pneumatic flexible tool through the high-pressure air pipe and the drill rod; step 4, the pneumatic flexible tool drives the slitting device to rotate to complete the slitting and permeability enhancement of the coal hole. The method has the advantages of safety, high efficiency and low cost.

Description

Technical Field

[0001] The present application relates to the field of coal seam gas extraction, and in particular to a method for decompression and permeability enhancement using a pneumatic flexible cutter. Background Art

[0002] As my country's basic energy and industrial raw material, coalbed methane is listed as a strategic priority for energy science and technology innovation. With the development of the national economy, my country's demand for energy has increased dramatically. The efficient exploitation of coalbed methane can not only solve my country's energy shortage problem, but also has important significance for my country's coal mine safety production, energy conservation and emission reduction, and environmental governance. my country's coal seams have complex geological structures, most of which are soft coal seams with low permeability and poor permeability. During the mining process, problems such as well wall collapse and reduced permeability often occur. Therefore, it is particularly important to improve the mining rate and utilization rate of soft coal seams.

[0003] Pressure relief and permeability enhancement are important means to strengthen gas extraction and prevent and control gas disasters. Due to the relatively developed natural fissures and bedding in the reservoir, water has a significant effect on the infiltration and softening of the coal body. The currently used hydraulic cavitation, hydraulic fracturing, water jet expansion, hydraulic slitting and other pressure relief and permeability enhancement technologies are not suitable for soft coal seams, resulting in negative effects such as well wall collapse, water lock, drill holding, and hole collapse during the drilling process, which weakens the gas extraction effect, and consumes a lot of water resources and is not easy to recycle. In addition, the use of high-pressure abrasive gas jets to break coal for pressure relief and permeability enhancement, and the high-speed gas accelerates the abrasive, which will cause great damage to the pipeline and nozzle. The abrasive and coal slag are mixed and difficult to recycle. The construction cost is high, and the abrasive particles generated are scattered in the air, polluting the working environment and endangering the health of construction workers.

[0004] In order to effectively extract coal seam gas, the patent "Underground Pulse Hydraulic Slit-Fracturing Integrated Permeability Extraction Device and Method for Coal Mine" (CN201510076753.5) uses a pulse water pressure generation system for hydraulic fracturing and releases water from the fracturing holes, which can effectively extract coal seam gas. However, this method has certain limitations for soft coal seams, and water locks are prone to occur. Water also has a certain negative impact on the migration and desorption of gas. Although the patent "High-pressure Abrasive Gas Jet Coal Breaking Pressure Relief Permeability Enhancement Equipment and Method" (CN201510006074.0) avoids the hole collapse problem that occurs during hydraulic punching, it causes certain damage to the experimental equipment, the experimental cost is high, and it pollutes the environment. Summary of the invention

[0005] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0006] To this end, the purpose of this application is to propose a method for pressure relief and transparency enhancement using a pneumatic flexible tool, which has the advantages of safety, high efficiency and low cost.

[0007] To achieve the above-mentioned purpose, the embodiment of the present application proposes a method for pressure relief and permeability enhancement using a pneumatic flexible tool, the method comprising the following steps: step 1, connecting an air compressor, a high-pressure air pipe, a drilling rig, a drill rod, a pneumatic flexible tool and a slitting device in sequence; step 2, adjusting the position of the drill rod and moving the slitting device to the target position in the coal hole; step 3, turning on the air compressor and delivering high-pressure gas to the pneumatic flexible tool through the high-pressure air pipe and the drill rod; step 4, the pneumatic flexible tool drives the slitting device to rotate to complete the slitting and permeability enhancement of the coal hole; wherein the pneumatic flexible tool comprises a shell defining a plurality of gas channels, each of the gas channels is provided with a rotor assembly, the rotor assembly comprises an integrally formed first rotor disk and a second rotor disk, the first rotor disk and the second rotor disk can be driven to rotate by the gas flowing through, the planetary gear at the output end of the rotor assembly is meshed with a gear ring formed on the shell, a sun gear meshed with the planetary gear is arranged at the axis of the gear ring, and the output end of the sun gear is provided with the slitting device.

[0008] According to the method of pressure relief and transparency enhancement using a pneumatic flexible tool proposed in the embodiment of the present application, the gas pressure energy can be converted into the rotational kinetic energy of the rotor disk through the cooperation of the gas channel and the rotor assembly. The rotational kinetic energy of the rotor disk can be output to the cutting device in the form of flexible torque through the cooperation of the planetary gear and the sun gear, thereby achieving the purpose of pressure relief and transparency enhancement in the cutting of soft coal seams, with the advantages of safety, high efficiency and low cost.

[0009] In addition, the pressure relief and anti-reflection method using a pneumatic flexible tool proposed in this application may also have the following additional technical features:

[0010] Further, the housing is coaxially arranged with the drill rod.

[0011] Furthermore, the plurality of gas channels are arranged in rotational symmetry within the housing.

[0012] Furthermore, the gas inlet of the gas channel is communicated with the drill rod.

[0013] Furthermore, a gas outlet of the gas channel is formed on a peripheral surface of the shell.

[0014] Furthermore, the rotor assembly also includes a fixed disk fixedly connected in the gas channel, and the rotor disk is rotatably connected to the fixed disk.

[0015] Furthermore, the fixing plate is configured with evenly distributed first air holes.

[0016] Furthermore, a guide wheel is arranged between the first rotor disk and the second rotor disk.

[0017] Further, end surfaces of the first rotor disk and the second rotor disk are configured.

[0018] Furthermore, the cutting device includes a flexible cutter arranged on the circumferential surface of the output shaft of the sun gear, and a drill bit arranged on the end surface of the output shaft of the sun gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the embodiments described below are only used to explain the present application, rather than to limit the scope of the present application. In the accompanying drawings:

[0020] Figure 1 is a flow chart of a method for pressure relief and anti-reflection using a pneumatic flexible tool according to an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of the installation of a pneumatic flexible tool according to an embodiment of the present application;

[0022] Figure 3 is a schematic diagram of a pneumatic flexible tool according to an embodiment of the present application;

[0023] Figure 4 is a schematic diagram of the distribution of the gas inlet of the gas channel according to an embodiment of the present application;

[0024] Figure 5 is a schematic diagram of a fixed disk according to an embodiment of the present application;

[0025] Figure 6 is a schematic diagram of a first rotor disk according to an embodiment of the present application;

[0026] Figure 7 is a schematic diagram of a guide wheel according to an embodiment of the present application;

[0027] Figure 8 is a schematic diagram of a second rotor disk according to an embodiment of the present application;

[0028] Fig. 9 is a schematic diagram of the distribution of planetary gears according to an embodiment of the present application;

[0029] Reference numerals:

[0030] 1. Pneumatic flexible tool;

[0031] 2. Drill pipe;

[0032] 3. Drilling rig;

[0033] 4. High pressure air pipe;

[0034] 5. Air compressor;

[0035] 6. Coal seam;

[0036] 7. Cutting;

[0037] 10. Shell;

[0038] 20. Gas channel;

[0039] 30. Rotor assembly;

[0040] 40. Planetary gear;

[0041] 50. Sun gear;

[0042] 60. Slitting device;

[0043] 11. Main gas line;

[0044] 12. Ring gear;

[0045] 21. Air inlet;

[0046] 22. Exhaust port;

[0047] 31. a first rotor disk;

[0048] 311, first guide groove;

[0049] 312, the first gap;

[0050] 32. a second rotor disk;

[0051] 321, second guide groove;

[0052] 322, the second gap;

[0053] 33. Fixed plate;

[0054] 331, first pore;

[0055] 332, fixed axis;

[0056] 34. Guide wheel;

[0057] 341, second pore;

[0058] 35. Rotor disc output shaft;

[0059] 51. Sun gear output shaft;

[0060] 511, connection hole;

[0061] 52. Assembly hole;

[0062] 61. Chain;

[0063] 611, connecting bolt;

[0064] 612, cutting teeth;

[0065] 62. Drill bit. DETAILED DESCRIPTION

[0066] The preferred embodiments of the present application are described in detail below in conjunction with examples. However, it should be understood by those skilled in the art that these exemplary embodiments are not meant to form any limitation to the present application. In addition, the features in the embodiments of the present application may be combined with each other without conflict. In different drawings, the same parts are represented by the same reference numerals, and for the sake of brevity, other parts are omitted, but this does not mean that other parts cannot be included. It should be understood that the size, proportional relationship and number of parts of the various parts in the drawings are not intended to limit the present application.

[0067] Herein, unless otherwise specified, "axial" refers to the extension direction of the rotation axis around which the slitting device 60 rotates, "radial" refers to the radial direction relative to the rotation axis, and "circumferential" refers to the circumferential direction relative to the rotation axis, that is, the direction surrounding the rotation axis.

[0068] like Figures 1 to 9 As shown, according to an embodiment of the present application, a method for decompression and permeability enhancement using a pneumatic flexible tool comprises the following steps: step 1, connecting an air compressor 5, a high-pressure air pipe 4, a drilling rig 3, a drill rod 2, a pneumatic flexible tool 1 and a slitting device 60 in sequence; step 2, adjusting the position of the drill rod 2, and moving the slitting device 60 to the target position of the coal hole in the coal seam 6; step 3, turning on the air compressor 5, and delivering the high-pressure gas to the pneumatic flexible tool 1 through the high-pressure air pipe 4 and the drill rod 2; step 4, the pneumatic flexible tool 1 drives the slitting device 60 to rotate to complete the slitting of the coal hole 7 Anti-reflection; wherein, the pneumatic flexible tool 1 includes a shell 10 defining a plurality of gas channels 20, each gas channel 20 is internally provided with a rotor assembly 30, the rotor assembly 30 includes an integrally formed first rotor disk 31 and a second rotor disk 32, the first rotor disk 31 and the second rotor disk 32 can be driven to rotate by the gas flowing therethrough, the planetary gear 40 at the output end of the rotor assembly 30 is meshed with a ring gear 12 formed in the shell 10, a sun gear 50 meshed with the planetary gear 40 is arranged at the axis of the ring gear 12, and a slit device 60 is provided at the output end of the sun gear 50.

[0069] Among the related technologies, hydraulic cutting and pressure relief and permeability enhancement technology is not suitable for soft coal seams, which can easily lead to negative effects such as well wall collapse, water lock, drill bit sticking, and hole collapse during drilling, which weakens the gas extraction effect, consumes a lot of water resources, and is not easy to recycle. In addition, the use of high-pressure abrasive gas jets to break coal for pressure relief and permeability enhancement, and the high-speed gas accelerates the abrasive, which will cause great damage to the pipeline and nozzle, and the abrasive and coal slag are mixed, which is difficult to recycle. The construction cost is high, and the abrasive particles generated are scattered in the air, polluting the working environment and endangering the health of construction workers.

[0070] To this end, the present application discloses a method of pressure relief and transparency enhancement using a pneumatic flexible tool. Through the cooperation of the gas channel 20 and the rotor assembly 30, the high-pressure gas can drive the rotor disk to rotate when passing through the rotor assembly 30, thereby converting the gas pressure energy into rotational kinetic energy. Then, by utilizing the cooperation of the planetary gear 40 and the sun gear 50, the rotational kinetic energy can be output to the slitting device 60 in the form of a flexible torque, thereby ultimately achieving the purpose of slitting and transparency enhancement, with the advantages of safety, high efficiency and low cost.

[0071] It should be understood that the present application utilizes the mechanical coal breaking method of the slitting device 60 to perform slitting pressure relief and permeability enhancement. Compared with the traditional hydraulic slitting pressure relief measures, it can convert pressure energy into rotational kinetic energy, has a high energy conversion rate, improves slitting efficiency, and can reduce the cost of coal seam 6 pressure relief and permeability enhancement.

[0072] The method of the present application is used to perform slit pressure relief and permeability enhancement. The device is easy to connect, simple to operate, easy to recycle, and highly safe and reliable, and can provide a convenient and safe working environment for construction personnel.

[0073] In addition, the first rotor disk and the second rotor disk of the pneumatic flexible tool 1 can realize the superimposed use of output power, fully utilize the gas energy, improve work efficiency, reduce noise, and extend the service life; it adopts a planetary gear structure with high transmission efficiency and smooth movement.

[0074] According to one embodiment of the present application, the shell 10 is constructed as a whole in a cylindrical shape, and a main gas path 11 with a circular cross-section is constructed at the first end of the shell 10, and the main gas path 11 is fixedly connected to the drill pipe 2. The main gas path 11 is also connected to each gas channel 20. High-pressure gas is input into the main gas path 11 through the drill pipe 2, and then divided into multiple paths to flow into the gas channel 20.

[0075] The main gas path 11 is coaxially arranged with the shell 10, the gas channel 20 is circular along the cross section, and the axis of each gas channel 20 is parallel to the axis of the shell 10, and each gas channel 20 is evenly distributed on the periphery of the main gas path 11. The inner diameter of the air inlet 21 of each gas channel 20 is smaller than the inner diameter of the gas channel 20, and the air outlet 22 of each gas channel 20 is formed on the peripheral surface of the shell 10, and the axis of the air outlet 22 is arranged perpendicular to the axis of the shell 10.

[0076] It should be understood that the gas discharged through the gas outlet 22 can discharge the coal slag in a timely manner, which can not only prevent the coal slag from clogging the gas outlet 22 , but also prevent the coal slag from accumulating on the outside of the shell 10 .

[0077] Optionally, three gas channels 20 are defined inside the housing 10 .

[0078] According to one embodiment of the present application, the rotor assembly 30 includes a first rotor disk 31, a second rotor disk 32, a fixed disk 33, a guide wheel 34 and a rotor disk output shaft 35, wherein the first rotor disk 31, the second rotor disk 32 and the rotor disk output shaft 35 are an integrated structure, the first rotor disk 31 is located between the second rotor disk 32 and the air inlet 11, the rotor disk output shaft 35 is fixedly connected to the end of the second rotor disk 32, and the first rotor disk 31, the second rotor disk 32 and the rotor disk output shaft 35 are coaxially arranged.

[0079] The first rotor disk 31 and the second rotor disk 32 are spaced apart in the axial direction, and their outer diameters are substantially equal to the inner diameter of the gas channel 20 . The first rotor disk 31 and the second rotor disk 32 are rotatably disposed inside the gas channel 20 .

[0080] A plurality of first guide grooves 311 are constructed on the end surface of the first rotor disk 31, and the plurality of first guide grooves 311 are evenly distributed along the circumference of the first rotor disk 31. A first gap 312 exists between each first guide groove 311 and the inner wall of the gas channel 20. The high-pressure gas flows along the first guide grooves 311, flows to the second rotor disk 32 through the first gap 312, and drives the first rotor disk 31 to rotate.

[0081] A plurality of second guide grooves 321 are constructed on the end surface of the second rotor disk 32 close to the first rotor disk 31, and the plurality of second guide grooves 321 are evenly distributed along the circumference of the second rotor disk 32. A second gap 322 exists between each second guide groove 321 and the inner wall of the gas channel 20. The high-pressure gas flows toward the gas outlet 22 along the second gap 322 and drives the second rotor disk 32 to rotate.

[0082] It should be understood that when the high-pressure gas passes through the rotor assembly 30, most of the gas pressure energy will be converted into rotational kinetic energy at the first rotor disk 31, and the remaining pressure energy of the high-pressure gas flowing out of the first rotor disk 31 will be converted into rotational kinetic energy at the second rotor disk 32. Since the first rotor disk 31 and the second rotor disk 32 are an integrated structure, the energy conversion rate is greatly improved and the cost is reduced.

[0083] According to one embodiment of the present application, a fixed disk 33 is arranged between the first rotor disk 31 and the air inlet 11, the fixed disk 33 is fixedly connected to the inner wall of the gas channel 20, and the fixed disk 33 and the gas channel 20 are arranged coaxially, and first air holes 331 are constructed on the fixed disk 33, and the first air holes 331 are evenly distributed along the circumference of the fixed disk 33, and the high-pressure gas flows to the first rotor disk 31 through the first air holes 331.

[0084] A fixing shaft 332 is formed on the fixing disk 33 , and the first rotor disk 31 is rotatably locked on the fixing shaft 332 .

[0085] According to one embodiment of the present application, a guide wheel 34 is arranged between the first rotor disk 31 and the second rotor disk 32, the guide wheel 34 is fixedly connected to the inner wall of the gas channel 20, and the guide wheel 34 and the gas channel 20 are coaxially arranged, and the connecting section of the first rotor disk 31 and the second rotor disk 32 is rotatably inserted into the guide wheel 34, and the guide wheel 34 and the first rotor disk 31 and the second rotor disk 32 maintain a certain axial spacing.

[0086] The guide wheel 34 is provided with second air holes 341 , and the second air holes 341 are evenly distributed along the circumference of the guide wheel 34 . The extension direction of the second air holes 341 is parallel to the axis of the gas channel 20 . The high-pressure gas flowing out of the first rotor disk 31 will flow to the second rotor disk 32 through the second air holes 341 .

[0087] The second air holes 341 can allow the high-pressure gas to flow toward the second rotor disk 32 along the axial direction. That is, the second air holes 341 can keep the flow direction of the gas flowing toward the second rotor disk 32 the same as that of the gas flowing toward the first rotor disk 31 .

[0088] According to one embodiment of the present application, the rotor disk output shaft 35 is fixedly connected to the end surface of the second rotor disk 32 and is coaxially arranged with the second rotor disk 32 . The end of the rotor disk output shaft 35 extends out of the gas channel 20 and is fixedly connected to the planetary gear 40 .

[0089] A ring gear 12 is defined inside the housing 10 and is coaxially arranged with the housing 10. The planetary gears 40 are located inside the ring gear 12 and mesh with the ring gear 12. The sun gear 50 is also located inside the ring gear 12 and is coaxially arranged with the ring gear 12. The sun gear 50 meshes with the planetary gears 40. The three planetary gears 40 are evenly distributed on the periphery of the sun gear 50.

[0090] The sun gear output shaft 51 is fixedly connected to the sun gear 50 and arranged coaxially with the sun gear 50 . The sun gear output shaft 51 extends to the outside of the housing 10 . The slitting device 60 is fixedly connected to the sun gear output shaft 51 .

[0091] Through the cooperation between the sun gear 50 and the planetary gear 40 , the sun gear output shaft 51 can output a flexible torque.

[0092] According to one embodiment of the present application, the cutting device 60 includes a flexible tool and a drill bit 62, wherein the flexible tool is a chain 61, the surface of the chain 61 is configured with cutting teeth 612, the chain 61 is fixedly connected to the circumferential surface of the sun gear output shaft 51 by a connecting bolt 611, and the drill bit 62 is a three-wing drill bit, which is fixedly connected to the end face of the sun gear output shaft 51 and is coaxially arranged with the sun gear output shaft 51.

[0093] Optionally, a connecting hole 511 is configured on the circumference of the sun gear output shaft 51 , and the connecting bolt 611 is threadedly connected inside the connecting hole 511 .

[0094] It should be noted that the chain 61 rotates synchronously with the sun gear output shaft 51, and the impact kinetic energy of the chain 61 is used to impact and crush the coal body, so as to achieve the purpose of coal seam cutting pressure relief, avoid the water lock effect caused by hydraulic cutting measures, and improve construction efficiency.

[0095] According to the pneumatic flexible tool proposed in the embodiment of the present application, the gas pressure energy can be converted into the rotational kinetic energy of the rotor disk through the cooperation of the gas channel and the rotor assembly. Through the cooperation of the planetary gear and the sun gear, the rotational kinetic energy of the rotor disk can be output to the cutting device in the form of flexible torque, thereby achieving the purpose of relieving pressure and increasing the permeability of the cutting of soft coal seams, and has the advantages of safety, high efficiency and low cost.

[0096] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for pressure relief and anti-reflection using a pneumatic flexible tool, the method comprising the following steps: Step 1: Connect the air compressor, high-pressure air pipe, drilling rig, drill rod, pneumatic flexible cutter and cutting device in sequence; Step 2, adjusting the position of the drill rod and moving the cutting device to the target position in the coal hole; Step 3, turning on the air compressor to deliver high-pressure gas to the pneumatic flexible cutter through the high-pressure gas pipe and the drill rod; Step 4, the pneumatic flexible tool drives the slitting device to rotate to complete the slitting and permeability enhancement of the coal hole; wherein the pneumatic flexible tool includes a shell defining a plurality of gas channels, each of the gas channels is provided with a rotor assembly, the rotor assembly includes an integrally formed first rotor disk and a second rotor disk, the first rotor disk and the second rotor disk can be driven to rotate by the gas flowing therethrough, the planetary gear at the output end of the rotor assembly is meshed with a gear ring formed in the shell, a sun gear meshed with the planetary gear is arranged at the axis of the gear ring, the slitting device is provided at the output end of the sun gear, the shell is coaxially arranged with the drill pipe, and a plurality of The gas passage is arranged in rotational symmetry in the shell, the air inlet of the gas passage is communicated with the drill pipe, the air outlet of the gas passage is formed on the circumferential surface of the shell, the rotor assembly also includes a fixed disk fixed in the gas passage, the rotor disk is rotatably connected to the fixed disk, the fixed disk is configured with uniformly distributed first air holes, a guide wheel is arranged between the first rotor disk and the second rotor disk, the end surfaces of the first rotor disk and the second rotor disk are configured with guide grooves, the guide wheel is configured with second air holes, the second air holes are uniformly distributed along the circumference of the guide wheel, and the extension direction of the second air holes is parallel to the axis of the gas passage.

2. The method for pressure relief and anti-reflection using a pneumatic flexible tool as claimed in claim 1, characterized in that: The slitting device includes a flexible cutter arranged on the circumferential surface of the output shaft of the sun gear, and a drill arranged on the end surface of the output shaft of the sun gear.

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